Click on the screen to start the game. Turn the Earth by swiping your finger or mouse to focus at the invading planets. Let go to launch the Earth's weapons at the enemies. Collect power-ups to improve your weapons and raise your shooting speed. Evade incoming attacks from the enemy planets to keep going. Crash all invading planets to progress to the next level. Utilize the moon's help when available to double your firepower. Monitor the increasing speed and number of enemies as you move up through the levels.